Shia LaBeouf is acting up again -- but this time, the troubled star was goaded into the bad behavior.

The actor punched a fan in the face -- at the fan's request -- during his latest performance art project, a piece called #ELEVATE, which took place inside an elevator at Britain's Oxford University union from 9 a.m. on Feb. 19 to 9 a.m. on Feb. 20.

The fan, a student who identified himself to the actor as a fellow performance artist, waited in line for seven hours, reports Britain's Mirror, for a chance to be in the elevator with the "Transformers" star.

"I'm a performance artist. Can you help me with completion of my next piece by punching me in the face?" the student asked Shia, who replied, "Oh man, you want me to punch you in the face? I don't want to punch you very hard!"

Shia continued to express his reluctance, after which the fan pleaded, "Or a slap at least?"

The 24-hour experiment was live-streamed on YouTube, but the punch took place after the elevator doors closed -- yet the moment of contact can clearly be heard in this audio.

Artists Nastja Sade Rönkkö and Luke Turner collaborated with Shia on #ELEVATE, in which they invited small groups of people to participate by hanging out with them inside the Oxford Union elevator.

"Part of the democratic nature of the performance the trio are exploring is this very odd social feel of who goes in the elevator, how many people can fit inside, how long do you spend in there," Jack Lennard, a spokesperson for Oxford Union, said of Shia's experiment. "Part of the art project in itself is there is no real set time limit or set amount of people who can go in at any one time."

The elevator stunt is just the latest in Shia's performance art repertoire. In December 2015, he set up a call center to encourage the public to phone him and "touch his soul."

And who can forget the time he showed up on a red carpet in 2014 with a paper bag over his head bearing the message "I am not famous anymore"?

Shia also hosted an experimental art exhibit titled #IAMSORRY in Los Angeles that same year, in which he sat, silent, at a table. He later told Dazed magazine, "One woman who came with her boyfriend, who was outside the door when this happened, whipped my legs for 10 minutes and then stripped my clothing and proceeded to rape me."